Exercise machine



FIG. 1 is a left side elevational view of an exercise machine showing our new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a bottom plan view thereof.

FIG. 4 is a front elevational view thereof.

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a left side elevational view thereof, the right side elevational view being a mirror image thereof with the pedal in a diametrically opposite position.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an exercise machine, as shown and described. 